<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header @add="add" />
      <!-- 将数据传到list那里显示 -->
      <List :todoData="todoData" @del="del" @set="set" />
      <Footer @delAll="delAll" @setAll="setAll" :todoData="todoData" />
    </div>
  </div>
</template>

<script>
import Footer from "./components/Footer.vue";
import Header from "./components/Header.vue";
import List from "./components/List.vue";
export default {
  name: "App",
  components: { Footer, List, Header },
  data() {
    return {
      todoData: [],
    };
  },
  methods: {
    // 1.添加数据的方法
    add(newTodo) {
      this.todoData.unshift(newTodo);
    },
    // 2.删除数据的方法
    del(id) {
      this.todoData = this.todoData.filter((item) => item.id !== id);
    },
    // 3.勾选时修改数据的状态
    set(id) {
      this.todoData = this.todoData.map((item) => {
        return item.id === id ? { ...item, done: !item.done } : item;
      });
    },
    //4.删除所有已勾选的数据
    delAll() {
      this.todoData = this.todoData.filter((item) => !item.done);
    },
    // 5.全选的方法
    setAll(value) {
      this.todoData = this.todoData.map((item) => ({ ...item, done: value }));
    },
  },
  // 监听数据
  watch: {
    todoData: {
      deep: true,
      handler() {
        localStorage.setItem("todoData", JSON.stringify(this.todoData));
      },
    },
  },
  // 挂载完成后获取数据
  mounted() {
    this.todoData = JSON.parse(localStorage.getItem("todoData") || "[]");
  },
};
</script>

<style scoped>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>